Anchor bolt



y 1937- H. R. WHEELER r AL 2,079,538

ANCHOR BOLT Filed Aug. 14, 1936 1%r020 ZflZeeZen Geo/ye Z0; Dress.

INVENTORS ATTORN EYS Patented May 4, 1937 PATENT OFFICE ANCHOR BOLT Harold R. Wheeler and George W. Dress, Harrisburg, Pa.

Application August 14, 1936, Serial No. 96,088

2 Claims.

This invention relates to anchor bolts particularly adapted to connect together adjoining blocks of concrete or other material.

An object of the present invention is to provide an anchor bolt having a pair of downwardly opening parallel hooks having their inner ends flared and formed integral with the open end of an exteriorly threaded sleeve provided interiorly with radially disposed stops against which lead slugs may be deformed by a plunger passed into the sleeve between the hooks for the purpose of expanding the sleeve to wedge the same in an opening, the construction just described permitting the device to be applied to openings of much larger diameter than hitherto possible, without breakage of the parts or without danger of the sleeve working loose.

With the above and other objects in view the invention consists of certain novel details of construction and combinations of parts hereinafter fully described and claimed, it being understood that various modifications may be resorted to within the scope of the appended claims without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawing forming part of this specification,

Figure l is a side elevation of an anchor bolt constructed in accordance with the invention, with a portion of the sleeve broken away to expose one of the stop lugs.

Figure 2 is a plan view of the anchor bolt shown in Figure 1 applied preparatory to expansion in an opening in a concrete block.

Figure 3 is a cross sectional view taken on the line 33 of Figure 1.

Figure 4 is an end elevation of the anchor bolt looking toward the hooks.

Figure 5 is a detail perspective view of the plunger for expanding the slugs.

Figure 6 is a detail perspective view of one of the slugs.

Figure 7 is a longitudinal sectional view through adjacent slabs of concrete showing the anchor bolt in applied position to lock the slabs together.

Referring now to the drawing in which like characters of reference designate similar parts in the various views, l designates a pair of parallel downwardly opening hooks, the rear ends I! ofwhich are flared and merge with the circular end face of a sleeve l2 as best shown in Figures 1, 2, and 3.

The sleeve I2 is exteriorly threaded as shown at l3 from a short distance from the hooks to the extreme end of the sleeve. The threaded portion of the sleeve is provided with a plurality of slots M which extend longitudinally of the sleeve from the extreme end thereof to the smooth portion of the sleeve. Preferably these slots are placed substantially a quadrant distance apart as best shown in Figure 3.

A pair of radially disposed lugs l5 are formed integral with the inner wall of the sleeve at diametrically opposite points thereof as also best 10 shown in Figure 3. These lugs form stops to retain a plurality of lead slugs I6 in the bore of the sleeve, one of the slugs being shown in Figure 6.

In applying the anchor hooks an opening H is formed in a block of concrete I8 or similar material, and the sleeve is inserted endwise in the opening until the flared rear ends I l of the hooks are disposed at the flat end face IQ of the concrete. A cylindrical plunger may now be in- 20 serted between the hooks and hammered against the lead slugs 5 which latter are deformed radially by impact of the blows and deform the cylinder radially as best shown in Figure 7 until the screw thread l3 bites into the wall of the opening H. The deformed slugs maintain the sleeve deformed and wedged tightly in the opening so that accidental dislodgement will be prevented.

The adjoining block 2| of concrete may now be poured in the usual manner to completely enclose the hooks l0, some of the material, of course, flowing inbetween the flared rear ends H of the hooks and flowing inbetween the hooks themselves to rigidly anchor the hooks in the block when the concrete sets.

From the above description it is thought that the construction and operation of the invention will be fully understood without further explanation.

What is claimed is:

1. An anchor bolt comprising a pair of parallel hooks having their inner ends flared, a sleeve open at one end and formed integral at the open end with the flared ends of the hooks, a lug projecting radially from the sleeve across the bore of, and a plurality of deformable slugs in the bore of the sleeve in advance of said lug and held in the bore by the lug, there being longitudinal slots in the sleeve adapted to permit the portions of the sleeve between the slots being expanded radially when said slugs are deformed, the hooks being spaced apart sufficiently to permit insertion of a hammering tool in the bore of the sleeve for deforming the slugs.

2. An anchor bolt comprising a pair of parallel 55 points of the sleeve forming stops, and a plurality of lead slugs in the bore of the sleeve disposed in a row in advance of said stops, the hooks being spaced suinciently apart to permit insertion of a plunger in the sleeve for hammering the lead slugs to deform the slotted portion of the sleeve radially to cause the screw thread to bite into the wall of the opening in which said sleeve may be inserted HAROLD R. WHEELER.

GEORGE W. DRESS. 

